Utf8 t = (Utf8) tuple.get(index);
if(t == null) {
t = new Utf8();
tuple.set(index, t);
}
t.readFields(input);
}
protected void readCustomObject(DataInputStream input, ITuple tuple, Class<?> expectedType, int index,
Deserializer customDeser) throws IOException {
int size = WritableUtils.readVInt(input);